Steam-boiler furnace



UNTTED sTATEs PATENT clarion.

JdR. ROBINSON, OF BOSTON, MASSACHUSETTS.

STEA1VI-BOILER FURNACE.

Specification 01:` Letters Patent No. 32,318, dated May 14, 1861.

To all .whom it may concern: I

Be 1t known that I, J. R. ROBINSON, of Boston, in the county of Suffolk and State of lllassachusetts, have invented a' new and' c verse vertical section of'the same in the line y, y, of Fig. l.

Similar letters of reference indicate corresponding parts in the several figures.

, This invention relates to the employment of a gas-mixing chamber arranged in rear of the lire-chamber, between the latter and the flue or iues or tubes of the boiler. It consists in a certain construction and arrangement of two walls separating the two i Chambers and a certain novel system of passages in said walls, whereby the mixture of the gases of combustion and the air which leaves the lire-chamber in an uncombined state is caused to be partly effected in their passage through and between said walls and to be completed in a very perfect manner in the mixing-chamber.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

The boiler represented in the drawing is of the horizontal multi-tubular kind. The inner part a, b, c, corresponds in its construction with the lire box of an ordinary locomotive boiler but is made of much greater length in order that the fire chamber A, and gas mixing chamber B, may be included within it.

C, and D, are the two walls which separate the reichamber from the gasanixing-chaniber and which with their passages constitute my invention. These walls are arranged at a short distance apart and both extend all across the inner portion c, I), c, of the boiler in rear of the re grate Gr, and have an upright space or chamber E, between them. The rear wall C, extends up to the top of the inner portion a, Z), c, of the boiler, but the front wall D not so high. The front wall D, has a passage CZ, through it, forming a communication between the fire-chamber and the chamber E, the said passage extending nearly all across the wall as shown in Fig. 2, and its bottom being about the height of the top of an ordinary lire bridge.. The space between the walls C, and D, is partly closed at the top by a cover F, but in this cover there is a passage f, fitted with sliding valves g, g, of lire brick. Between this cover F, and the top of the inner part a, o, c, of the boiler, there is a space I-I, of considerable depth. The back wall C, has passages c, e,

through its lower part one at each side commencing about, or a little above half way up, and extending downward obliquely toward the center so as to nearly meet at the bottom as shown in Fig. 3, but instead of these passages, several smaller passages may be provided in t-he lower part of the wall C, as the equivalents of c, c; or a number of smaller passages may be provided as well as the larger passages c, e. The greater portion of the gases of combustionmand uncombined air pass from the tire box A, through the passage d, into the chamber E, between the walls O, D, but the lighter gases which ascend to the upper part of the fire-chamber above the top of the passage cl, are drawn into the space H, and caused to pass through the passage f, into the chamber E, and on their entrance into the said chamber meet the gases and air entering through el, and all pass together down the chamber E, becoming partly mixed on their way, and from thence pass through the passages e, e, into the lower part of the mixing-chamber B, rolling around the inner edges of the said passages with an eddylike movement. The portions entering the passages e, c, meet in the middle of the lower part of the mixing-chamber B, and as they rise with their rolling or eddy-like movement continued, the whole of the gases and air become so perfectly mixed that a perfect combination and combustion is eected.

In some cases it might for some reasons not be desired to have the means I have described for collecting and conveying away the lighter gases from the upper part of the fire-chamber, and in such cases the cover F,

of the chamber E, might be dispensed with, and the front wall D, be carried no higher than where the bottom of the passage d, is now represented. The opening between the top of the wall D, and the top of the box a, Z2, c, will then be the equivalent of the passage cZ. I prefer Vhowever always to use the separate passages f, f, for the lighter gases whenever practicable.

It, It, arek passages provided in the lower part of thewall C, D, F, to allow ashes and dirt to be raked from the bottom-of the gasmiXing-chamber B, into the ash pit, the botthem, the side Walls of the setting, in such case forming the sides of the tire-chamber, and gas-miXing-chamber, and the wall C, being carried up Close to the bottom of the boiler. Vhen in suoh application of my invention it is desired to have separate means of exit for the lighter gases from the firebers A, and B, being at the sides and above the lowest portion of the boiler.

Vhat I .claim as my invention and desire to secure by Letters Patent, is,'-

1. The two walls C,"D, and their interposed chamber E, and passages cl, e, e, constructed and arranged between the fire chamber A and gas-mixing chamber B, substantially as and for the purpose herein specified.

2. In combination with the said walls, interposed chamber, and passages, the within described arrangement of the passage or passages f, for the purpose specified.

J. R. ROBINSON.

W'itnesses LEwis A. TUCKER, C. W. Cow'rAU. 

